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6x + 3y = 21 (×2)
---------------
-12x + 15y = 21
12x + 6y = 42
------------------- +
21y = 63
y = 63/21
y = 3
6x + 3y = 21
6x + 3(3) = 21
6x + 9 = 21
6x = 21-9
6x = 12
x = 12/6
x = 2
jadi x=2 dan y=3
smoga membantu